User's Manual
Table Of Contents
- Contents
- Tables
- Figures
- 1 Introduction
- 2 Interface Characteristics
- 2.1 Application Interface
- 2.1.1 Pad Assignment
- 2.1.2 Signal Properties
- 2.1.3 USB Interface
- 2.1.4 Serial Interface ASC0
- 2.1.5 Serial Interface ASC1
- 2.1.6 UICC/SIM/USIM Interface
- 2.1.7 Digital Audio Interface
- 2.1.8 Pulse Code Modulation Interface (PCM)
- 2.1.9 Inter IC Sound Interface (I2S)
- 2.1.10 GPIO Interface
- 2.1.11 I2C Interface
- 2.1.12 SPI Interface
- 2.1.13 Pulse Counter
- 2.1.14 HSIC Interface (ELS51-VA Only)
- 2.1.15 SDIO Interface (ELS51-VA Only)
- 2.1.16 Control Signals
- 2.2 RF Antenna Interface
- 2.3 Sample Application
- 2.1 Application Interface
- 3 Operating Characteristics
- 3.1 Operating Modes
- 3.2 Power Up/Power Down Scenarios
- 3.3 Power Saving
- 3.4 Power Supply
- 3.5 Operating Temperatures
- 3.6 Electrostatic Discharge
- 3.7 Blocking against RF on Interface Lines
- 3.8 Reliability Characteristics
- 4 Mechanical Dimensions, Mounting and Packaging
- 5 Regulatory and Type Approval Information
- 6 Document Information
- 7 Appendix
Cinterion
®
ELS31-VA/ELS51-VA Hardware Interface Description
3.2 Power Up/Power Down Scenarios
76
ELS31-VA_ELS51-VA_HID_v01.000 2017-01-04
Confidential / Preliminary
Page 58 of 106
3.2 Power Up/Power Down Scenarios
Do not turn on the ELS31-VA/ELS51-VA while it is beyond the safety limits of voltage and tem-
perature stated in Section 2.1.2.1. ELS31-VA/ELS51-VA will immediately switch off when these
conditions are detected. In extreme cases this can cause permanent damage to the module.
3.2.1 Turn on ELS31-VA/ELS51-VA
ELS31-VA/ELS51-VA can be turned on as described in the following sections:
• Connecting the operating voltage BATT_BB and BATT_RF (see Section 3.2.1.1).
• Hardware driven switch on by ON line: Starts Normal mode (see Section 3.2.1.2).
After startup or restart, the module will send the URC ^SYSSTART that notifies the host appli-
cation that the first AT command can be sent to the module (see also [1]).
3.2.1.1 Connecting ELS31-VA/ELS51-VA BATT Lines
Figure 31 shows sample external application circuits that allow to connect (and also to tempo-
rarily disconnect) the module‘s BATT_BB and BATT_RF lines from the external application‘s
power supply.
Figure 31 illustrates the application of power using an externally controlled microcontroller. The
transistor T2 mentioned in Figure 31 should have an R
DS_ON
value < 50m in order to minimize
voltage drops.
Such circuits could be useful to maximize power savings for battery driven applications or to
completely switch off and restart the module after a firmware update.
After connecting the BATT_BB and BATT_RF lines the module can then be (re-)started as de-
scribed in Section 3.2.1.2.
Figure 31: Sample circuit for applying power using an external µC
3.8V
Module
Place C2-C5 close to moduleµcontroller
ENABLE
BATT_BB/RF
BATT_IN
C1
100nF
C2 47µF,X5R
C3 47µF,X5R
C4 47µF,X5R
C5 47µF,X5R
C6 47µF,X5R
R1
100k
R2
100k
R3
100k
R6
10k
T1
BC857
T2
IRML6401